Hot-top ingot mold



Patented Sept. 1%, 1922.

- Learn Parent @IFFEQQ JOSEPH I. PEYTOII, F CHICAGO, ILLINOIS AND SAMUEL E. 'HITT, OF ELYRIA, 018110,

I HOT-TOP mieo'r MOLD.

Application filed June a, 1922. Serial no. 565.539.

2" 0 all whom it may concern Be 1t known that we, JOSEPH I. PEY'roN and SAMUEL E. Hrrr, citizens of the United States, residing, respectively, at Chicago, in

5 the county of Cook and State of Illinois, and

at Elyria, in the county of Lorain and State of Ohio, have invented certain new and useful Improvements in Hot-Top lngot Molds; and we do hereby declare the following to be a full, clear, and exact description of the'same, reference being had to the accompanying drawings, forming part of this specification.v i

This invention relates to" an ingot mold having a-vacuum chamber top which may or i may not beintegral with the mold body.

.The primary object of the present invention is to. improve the general construction of ingot mold bodies and particularly to improve upon the molds shown in certain of our previous patents, 'as for example No. 1,230,405 dated June 19, 1917 and No. 1,139,- 284 dated May ll, 1915.

A particular object of the present invention is the provision of a vacuum chamber having a flexible outer wall and a rigid inner wall-so connected that when either is worn out they may be separated and the yet-unworn member utilized in connection with a new inner or outer member as the t case may be.

A further object, of the invention is to pro;

vide a vacuum chamber hot top for ingot 2 molds. i

Hot top ingot molds are in fairly extensive use at the present time, the prlncipal and in fact the only objection to them being the quite great. cost due somewhat to the necessity for the use of better material than used in the older molds and somewhat to the great cost of forming the members in the foundry. It is old to provide an inner wall considerably thicken. than the outer wall of the mold and to have the outer wall flexible, but it is believed to be novelto fasten together the outer and inner walls of the vacuum chamberby' bolting or riveting to obtain the necessary strength and then by torch welding to insure an air tight joint giving the great advantage that if either the rigid member or the flexible member should wear out or fail for any reason while the other member is still good the worn member may readily be detached and replaced without the loss of the member which is still good. I In the drawings,- I

Figure 1 is a front view partly in section of a two-piece mold made in accordance with our invention.

F 2 is a plan view thereof. Fig. 3 is a vertical section on a large scale through the upper section of the mold.

Fig. 4k is a section through a one-piece mold.

The hot' top 10 together with the mold .11 constitute a complete ingot mold, the mold preferably being in two parts as shown in order to reduce the cost of the mold. At

'the inner wall of the vacuum chamber also of steel and in case the mold should be made in a single piece the mold would have to be entirely of steel, but by making the mold in two sections asshowli the upper portion may be of steel and the lower portion or mold body 11 may be made of cast iron. with a consequentquite material saving in cost.

The inner and outer surfaces 14 and 16 of the mold body are preferably continuous with the corresponding surfaces 15 and .17 of the hot top so that the hot top forms a smooth continuation of the mold body and constitutes the upper portion of an open top ingot mold. -If desired the inner diameter of the hot top may be slightly less than the minimum diameter mold body in order to facilitate the=remova1 of the mold from the ingot; but the preferred type is as illustrated.

. The upper periphery of the mold body 10 is slightly cut away to form a rabbet 18 which receives the downwardly extending flange 19 on the hot top. The joint between the hot top 10 and the mold body 11 as shown in Fig. 1 is .sealed with a clay fill 20 to prevent leakage of the molten metal, but

'it is preferable to omit this clay fill entirely and to .machine the hot top and the mold body to form snug fit in spite of the fact that this appreciably increases the cost of the mold. l

thesejannular flanges and forming together a series of stiffening ribs tokeep the-shell 21 from buckling or otherw1se getting out of shape. This shell as is customary is pro- 'vided with a relatively small central opening 24 through which the molten metal is poured when casting an ingot. The outer flexible member 25 'of the hot top is relatively thin in comparison with the shell 21 and, is preferably. formed of stamped sheet metal although it could easily be madeof a rolled shape bent to form'with a hammer welded seam or it couldreadily be made drop forged or in any'bt-her manner. This plate or outer shell is substantially the shape of a deep basin having a central hole to correspond with the orifice 24 of the inner memberor shell. The outer member is secured to the inner shell by means of bolts or rivets 27 at the upper portion and by similar fastening means 28 extending through the relatively thin flange 19; In case the mold is made in one piece as in Fig; 4 .the rivets 28 are replaced by rivets '30 which are upset into cavities 31 in the mold body, the construction of the two types being otherwise the same.

In referring particularly to Fig. 3 it will be noted that the vertical and horizontal ribs extend within a short distance of the plate or outer shell 25, this space 32 being sufficient to permit of the extremerelative expansion of the two members but is sufficiently small to insure against collapse of the relatively thin outer wall onaccount of the atmospheric pressure on the outside and the vacuum in the chamber between the shell 15 and the outer member A pipe 33 is welded to th outer shell 25 as at 2% and carries the usual valves 36 and 37 which are open when the chamber is to be exhausted and closed before disconnecting the hot top from the vacuum making machine. The use of two valves is common in the art and is merely to insure against loss of vacuum in common-in the art and forms'nopartof the present invention.

lVhat we claim is r 1 1. An ingot mold having a vacuum hot .top formed by spaced Walls characterized by the provision that one of said walls is replaceable and renewable.

2. A hot topingot moldhaving a vacuum chamber formed by two spaced walls the outer of said walls being renewable and reand being securedto said inner wall along its upper and lower margins.

5. An ingot mold of the hot top. type characterized by the provision of an'linner vacuum chamber wall of cast metal and an outer wall for said chamber of fabricated metal, said outer wall being relatively thin and being secured to said inner wall. along its upper and lowermargins, and means carried by said inner wall to limit collapse of said outer wall. 3

6. A two-piece ingot mold of the vacuum chamber hot top type characterized by the provision of a relatively thick webbed inner wall of the hot top, and a relatively thin annular shell of uniform thickness surrounding"said inner wall to form the vacuum chamber.

7. A two-piece ingot mold of the vacuum chamber hot top type characterized by the provision of a relatively thick'webbed inner wall of the hot top, a relatively thin annular shell of uniform thickness surrounding said inner wall to form the vacuum chamben and fastening means for securing said shell to u said inner wall.

8. A two-piece ingot mold of the vacuum chamber hot top type characterized by the provision of a relatively thick webbed, inner wall ofthe'hottop, a relatively thin annu- 1 lar shell of uniform thickness surrounding said inner wall to form the vacuum chamber fastening means for securing said shell to said inner wall and additional means for accurately posltioning said innerwallon a mold body.

JOSEPH I. PEYTUN. SAMUEL E. HITT. 

